The Xotic SP Compressor uses same operational transconductance amplifier (OTA) technology as in the Ross Compressor. It can render a variety of compressor tones and its dry Blend knob produces +15dB of boost while its internal dip switch adjusts attack. Built with true-bypass switching, it has 1-meg ohm input impedance, 1 K-ohm output impedance, and can be operated with a 9-volt battery or AC adaptor. For more go to xotic.us/effects.